feat(marketing): miami, overallocation card, misc fixes

Make FAQ headings medium instead of bold to differentiate question text from the FAQ card header
Add Miami location for new node
Make plan buttons just say 'Get started' instead of login
Add query string support for plans, which is also utilised when a user is logged out so the purchase modal auto-opens once logged in with their plan
Add card about how servers aren't over-allocated, linking to the new Pyro status page

modrinth / code